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At Boston Gear, we manufacture our FC couplings from the highest quality alloy steel - not from powdered metal as many other industrial manufacturers do. Consisting of two metal jaws - or hubs - and an insert, this style of coupling is suited for high-torque and shock loads, does not require lubrication, and is not affected by oil, grease, dirt, or moisture. The allowable torque for the FC series of couplings is determined by the insert material. These inserts are the wearing member of the coupling and can be easily replaced with minimal effort.Thru Bore Length2.156250Product FamilyFC CouplingsWeight3.501Product DescriptionShaft Coupling, 3 Jaw FC Series-Coupling HalfAltra Master No.30214706Bore Diameter1-7/16"Max HP (Poly Insert)34.3HP @1750 RPM MAXUPC781711082904Max OD3.000000Overall Assy Length7.000000Family Id30,018Coupling SizeFC30Hub Diameter2.750000Max Torque1,500Unit Of MeasureEnglish